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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8357790adcb22cf594da7af87ab38521da78858b5d16e33230ffafaca276ebc2' 
  AND token = 'gPP4Clckaoa+VFxnm6gWB+nzEYjm4ybKlAxEvv5f6Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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