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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a502d60580a8c3cff120ec8ebef07e26efd798aa0ce5f7899333ad4b83a96454' 
  AND token = 'TnNrtlbam8lC/qYo58ZPU9vM1FXgNA6xtPJxulC90Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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