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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff7b8f9309004f3077488010eab58047aa77b66f16a2deefa0fec92c9695748' 
  AND token = '1fZJ+kirsABoBeQC09aC9da4lPXq5r617S1dM3+kQm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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