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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5db2a977919469e4f10364c4577b9d84e4773bf53fa0666d1b6d45372675ba2' 
  AND token = 'I8P9zWvfFYc2/lxB9EbK9bG2uTstsVRAFa0/vuNMTeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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