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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b26db6327760c20e2d17b84d20c4ade9b82f7042cbd60f15cce88a3939cfdf' 
  AND token = 'hfSIo//sNXESYCIXamOknAIEQuZbLWDcb16WNTTTL50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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