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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7829fcee08b401dd918a0478f83c60afa9384c64fea506ec4737be3944d198fb' 
  AND token = 'ztdSkq/k53ymUk6ybIG6Eyk6Du75oKOEtWEtcEfq3WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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