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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7245cd9938df56a20c14f9d3ac0e703537fc1275f5bd05367b9a3aec9c6c032' 
  AND token = '4Vnc9fJpxWWXyvbdHb1nwadxV4key5V/HCzQUoL/ZkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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