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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e050d9551839748b831f1a6a445c1bec5d88be943d0358aebcb6cda37cadd2' 
  AND token = '41Ql2cAp0yI0oiehJ2dHLG2ZkzwDr2ngedfl+S7rInk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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