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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8697027b320740b39a78f407e448b872cc3e8c14f7c0d3f7f4bc55e28b8f3347' 
  AND token = 'x1XwfckhS5rzgekEHRjngM1j0HkNf4Aa30Bfipo8eZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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