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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ca1d8d8d250d1eab81c54c1bda777e9e543a2847410cad533971d3f7ff3f26' 
  AND token = 'nmpAZno7N8VOCEqEEQuVF2fEuPaGdGhZ6yXGW9mT+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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