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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02095421fa75f7e8d556b5ed0f714200286737a4e0ad17e287bdf00eba579c43' 
  AND token = 'EyeUTZAVFWiipNy2U3XXnRG9kWCoQIJF8IpoZg8KjsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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