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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d5e7fe4ea1443f894890f7e21bffae7a4ae091f6a05eaad72753b5cab89cf0' 
  AND token = 'jtVFO8uQas59i1wgqohkuVmaK8I398vnOFHCSbEDxQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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