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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4e142a55015e3436da0e52bea9042af701337c8b81b5b91f6726dd3d29368d' 
  AND token = '2U7MURo5KSBa2DeOZwjPtRuJIwswjgJyvN8opoffvSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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