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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91e28d0b65361ec57ca9df67ee66ca0c77022d19193a866866f73705c3e505f' 
  AND token = 'ov1bf4/p1qs8v8AMJENbA2EvJaokvOoHT3YFlKSoAxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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