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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c44d8f73bde6ad1bc10fa896c0fdb4eb791d62709abfd75bae6abe2cb3aeed' 
  AND token = 'JchxC9iYhC5vP5eKWEnX34BW0g9MqoRyFQ+HxfjVl8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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