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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c6e9fcc8bf9fa7c355a9969581bcfa3f4ea4c2e3cf301e8f85319f36af6f02' 
  AND token = 'ovYO/W0oXO9oPQVC2oyXkTobfsSfaBWS3A8kgpo5hsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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