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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d6adce84ccc99b482729b6c3f2d9268a66f4f5879eeb58ec9b95b5e824478b' 
  AND token = 'WhoaQEL8Ej+xb8H3qejGMUGwUH4UTXlQniO3dXomlFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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