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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7e13d4776ab540b71381cdc15396465e72add128a06d211df59e1d68571238' 
  AND token = 'gslnEhLx9bX1ragrg64/F6jVOe0PjW48Ws2swMG8wUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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