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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f98f6b3dd5476b843ff6a88b724addc285d379ba2fcee7816456d6d24be692' 
  AND token = 'cFis5UPQFwQ2cyKHJEYTo4eSbZn94e5g+eyD6H2zmsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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