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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c599bd4648ed698f10d9ee4536c17bb67047656a0dcdef08a00b22dc60b144d3' 
  AND token = 'vbSnnLcxPD00nm1k4QcU0a3Lhs07ETNLty65trr0zqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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