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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f9149914b4b3fb8f9b568092ac8d25ad89a35f2b21f6bd6b44302b65722f2e' 
  AND token = '8JZc/CEaG0er8vAR16AY41qjWghupdA2GxTiWHgw6vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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