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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d23c423f02ff28145ac3acae2a17caf855f66006f44496e930f1a0f8ebd6c8' 
  AND token = '4m37msIiJ5iuQjRZDoU+ipu+uOZ79+DqfOaMZKcd464=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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