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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6a775483d0a8e0b44e67bdcddb6c8a084b853974fb5df8f086988d5d40a66d' 
  AND token = 'BfDmByyZT4nZcYE2mml8h8bfK5rU/hIXmFJtuWBGkM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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