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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d0d775a6a4a0566a1963d56f7a0a8560dd9a7040c707516e11247bceccefd9' 
  AND token = 'Qeeo1+byEIvBO3B00G8Mxhqf54i7jFruxdf1Hmx7gxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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