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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7fd844cc3c766af84411619f7f60c2023f9f555d97e99c540e019a5b98f941' 
  AND token = 'XPeLAj5W4Q+uWTI3OYLHxjW+rKod9mPavVnaehHY174=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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