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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08763624f0f1c9758361fe4fd8da8cd2458f49e8b13760cd9584bc923b60c190' 
  AND token = '6DN/xOCCxxMYlFlL71VtwnxTN7FbEJDyaLzWP8jprHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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