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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62346acb8b7548da6f2c0ddae170866925fc62ca8807e441f924d798521dae7' 
  AND token = 'B7CNMDA/BpSdKfIDvo3R/b+MyNaoz91sRq98CM+dCbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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