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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e410e1096df81f45cabcf806c3d9ad885d66097ba85d1e3f65113ca1a6ee28' 
  AND token = '8awqdZOtk2babG+zB5OweUvt6DJ6fKd0sWt8tDe85RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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