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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175d2648e1d04aceaed9d173ce66ad02fe850698ebbbba953f5c58ad2ed596fb' 
  AND token = 'gCD0KC4FYIRio91Vw33tqSF3Zr5x+Lz0IXQ5Or3VaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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