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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e702ba6af6be43792ed969b5e44f63ff80d274514d68c6480d0634fa99f8a6a' 
  AND token = '7KEACOME4r26eXiVp/GtSuFICMkDev5o8XUkN3OJoFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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