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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beef6db89b78cf367e447dc2b9db25c8e00405e4f7190abcfdc9aef7f89797ec' 
  AND token = '5rGB2ES1H6jkfej8fwz9+fncXK2fnKl7KRUVGArt6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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