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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fc469891b8b9e88b0e4c99dcc40aab4373b1dfaac7b597efe6a50ad74cda94' 
  AND token = 'CEG3pK6+j8wxnnqh3/XNTwb/ih28MSsef8t6jXPrjVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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