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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c0ff9eef55deeef0d8b5e3141ddcef8e93f37df3b85bfdf13797fde2f03282' 
  AND token = 'pYj6A0vThW48mvjL28RmAK7Ffzjdz9XJnBA++mB+CL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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