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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2544145d3579c317b53df38425d2121a064d17d96d2b4174b2e9b4fa5e6d9596' 
  AND token = 'VnFYsyD/9X98A54KExLeNtP9b/Gl1mR5tbJKsUuATiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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