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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb19f2f99ec0066fb711f895d164ccae1c4e572b70c796c2a5dcb6ed84ac4f6' 
  AND token = '/beIF8CPxmYAPtyMDmI3cU1s0PI5UP7fecFLv2MxQhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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