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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065ddc0876e01a0529ccdf1c4001907c24c05d9d7b5de3f7d53076b4c4761d28' 
  AND token = 'Y5O6nWRQsE3Bwf4KEGz8+mCTWN5MWKE1YNndOArmUAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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