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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d122d2b7e6e324c4862e9ae9497f6a7b83bb7b6aec8f1017a6a7bc72241600c' 
  AND token = 'Q2A3bnV3IR/1LEIogmK+WTUgcUwJtGGUdPNftR/0Xfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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