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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85931375e03cdfc804195ed3e6fcb287460faf298ac1d5b12b235af755ab554b' 
  AND token = 'k+739s4AJIDrU903trkXDaWxh1Y7gOqSP1WXoIVSr5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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