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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac83a842debbb953b3afc72d8e50c563a5d8d3c08622d729c3f10972b3c92d4' 
  AND token = 'B945vT3zaGNByGPhhgDUr/vyLWl+nc42BEG7rRjCs3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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