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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc4212be8de5302690ad3c6ee3ad65880ed0929105d5f2bccd2798c6a34d8c0' 
  AND token = 'eJrzeR6GNWq4aRu392284ZDyPhZGEoP69HBx+IikLTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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