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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff07c6413c0f9ba2c8195d950ace87816c3274964060795d464125c6f65f13fb' 
  AND token = 'Cx+QxW2g7RMrehUA68TNjREwFLVaa0jBxWxwwDJDxAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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