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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1792b6edeba559ad0143c5105b9c126c4ba0b57d2cd0293d041710c699e2131c' 
  AND token = 'y2F8LbOVfQSJyn2ekVnkYyZ0xvTrANSTrnB/f+zagU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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