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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f40b0da8f13b9d0a20915116956a475c04c99940be0dcd2de31f26289195b3' 
  AND token = 'Lz9DVORMKdcg9MT9NrXF01MCedxBsZPu7pd/zL8cOWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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