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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363841b95a49a5351c1839f91975d903b12bd19901bf063761cfeeb6a26da375' 
  AND token = 'dVj3O37j1RBFhnqOVsGNIXVpQfrjCP4By+3C5Gx35Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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