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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45990f002aa0b2706a6a103562babb7c71577baf79dbb4557703e4e629e2d494' 
  AND token = '2MnzfA4TEQ/K18Wy2XSiOuBu7NaobHkq91onDiCC3k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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