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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8af7dcf12cb577a65b35b4342063d6e540d4419efc083087eade3ea7f74c309' 
  AND token = 'r8uh1CMyf206yJQn69Wydl2OJL9lqFHbhTlzcAMyLUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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