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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea06a7ee9a3faeefbda94b5464746d5afa643d96ced165a8c73195c48782e0b' 
  AND token = '0HDabxeTL6WoxdeQ3DQe0nhQFFa2pa6VmBjJg8gdUjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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