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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab7260a8d4862a761500dbd1d76119bb19e18ba79bd3c76a891aaa110d8628d' 
  AND token = '2PezT80TtP9gOrmpocD0YfhQlNGgmYP0QofeX05i+uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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