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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771fe9d8f8520d5815171b56190dc19308055d19e3c3c96a40db330327f21344' 
  AND token = 'Mdr0iC20WYUGa/MDSSdX340oiovRTZY0+GnhduURdn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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