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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f52bf7bef4f4ea1e9b85621e59430fd4f263ac12f95093b1e67c462605c2f8' 
  AND token = 'OV6Xplct5BjB7iY2FRDl+i8xAjXJY9B1nCd9ZLIDGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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