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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d03470bda73b1671647c3de5cd6231f660e0710b58d687fcfeb2e8b769adc3' 
  AND token = '8lennTsUeoitF+Y+1HL90LErhQG/R/Uma8aOoUncFAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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