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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e5d32e87ac18949b9507be9f18b5ed91d84042a43fc6b16d74e6b2ac8f2f9f' 
  AND token = '6R1b/eqnSJECsKM5sGY3ABgbATHQmxaseeo6irGl/NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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