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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651975153d99595aab53d95b9c226d12b9e75663b834b6a343d3a13ec2d9ae9a' 
  AND token = 'rKWfcTPYEj0kqDrYy7mmAQ0JPIebYtuuQphwl0Tyhsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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