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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c92c661c73db481a3aeac89a4baf31a7bd3223bfd0bf1ee0cbaae7b9b6a7542' 
  AND token = 'mbR9NWaugrEfrZtUB3oi8H25Xddr6MaCjrlOmTbTfjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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