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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3821f560caff3589b74204712a0993c42f5a4fa8388fb64ed7c141667376ae00' 
  AND token = 'lvG1mkgyaE+bBTl5QiErMyNY4VBKDhtbKsWaOoWgiUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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