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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a9719268f37455ee32c18a85685c9dfc7bf3bc59eeb799f93f5ff9e20d7869' 
  AND token = 'Usyf42/yJn5yNA7g9n5tXYyB2m/8bdVVyENM8hP1dQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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