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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e47c1fb5cfa97676dfdbd526245b5dec7c56f774568b13e700e291514cb1866' 
  AND token = '/pe5/k0q7KPgoUgyO6LkZAPpy8wvgi4/su++f0ywrXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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