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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9352c908a1c46d53590a5673a90efbeb68e4850a61d52120b15b88d5d9307257' 
  AND token = 'vcBeMXS80LoEbOKGU96PEPioYGqlcDD9IRnJs6HRqOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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