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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c45d116bc155dc811e73f7086457ea9d5be13bd12d6363ba53ddfdc8136bc49' 
  AND token = 'GfNOq9bZI/bpZhlP1KcXBu/pu+AYY5KcG4EsVR3gD80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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