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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf76124f6f8d46d0b45e2ab0ff66e249b580c88909ab9b022cd3e9869336ff2' 
  AND token = 'qJWC1c9pnTAwlvk2KV/N7Jnm5cMufw+GlRl/roA4r/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}