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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a051dfbd14945aaa32ba38100cb238329a09e294ffd602886f529dc06afda8' 
  AND token = 'hRqYY8B2ug6oxgrtc3s8XjHrDmDxVax4+1aT/8XkL9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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