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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8e3a32763dc608abbea62787857cbd6cf70e0436b4ea5e0ed11dfc15ed8a50' 
  AND token = '7xM0B4xblQlKNG0dGjz1Q2eSJ3XO4lN0SiNhgg18zxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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