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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441568c4a976ccaad10b8d579e8ecd9927bc122db928f70591965eae4467848f' 
  AND token = 'Jy/G1tRWhM+PZgeitzSpAa11Y2zNXFJPgwzbWP2uj2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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